Macrobrachium amazonicum (Heller, ). AphiaID. (urn:lsid: :taxname). Classification. Biota; Animalia. Pupil of a Macrobrachium amazonicum (freshwater shrimp). Alex H. Griman. Affiliation: Alex Kawazaki Photography São Paulo, Brazil. Technique. Macrobrachium amazonicum — Overview. Amazon River Media. Image of Macrobrachium amazonicum. Macrobrachium amazonicum Unreviewed.

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Figure 4 shows a specimen from each group, demonstrating differences in the cheliped size and the spination pattern. CL, with an estimated size at onset of morphological sexual amazonicm of 8.

In contrast, Vergamini et al. The mean value of wmazonicum angles for the four groups is presented on Table 4. Comparison of growth pattern until sexual maturity between the estuarine and upper freshwater populations of the prawn Macrobrachium nipponense de Haan within a river.

According to Ramos et al. Freshwater prawns of the genus Macrobrachium Bate, Crustacea: The male population of the lake of Ibitinga and from Pantanal presented mean sizes and number of morphotypes lower than the population studied here. In addition, the species has been used as bait in sport fishing and shows great potential for aquaculture Kutty, ; New,Moraes-Valenti and Valenti, Studies of natural populations of M.

As a consequence, males do not need to grow to a large size nor to develop large cheliped weapons that would aid them in battling other males for females. On the other hand, even if GC1 and GC2 have identical gonads and very similar body size, the macrobrahium in weight and size of chelipeds can be reflected in their different roles in the environment, which would characterize them as distinct castes.

Macrobrachium amazonicum

According to the allometric coefficients obtained in the morphometric analysis, morphotypes CC, GC1 and GC2 have very similar body size relationships between carapace and propodus Figure 3 and Table 3. The presence of these morphotypes in a species suggests that they guard and defend females during mating interactions Thiel et al.


Maximum body size was larger in natural habitats compared to the pond culture, suggesting reduced growth or a shorter life span under artificial mass rearing conditions. Allan Hancock Foundations Publications.

Maria Lucia Negreiros Fransozo and the anonymous reviewer for their extremely constructive comments on an earlier version of this manuscript; and to Dr. The relative growth was analyzed based on the change in growth patterns of certain body parts in relation to the independent variable CL.

After the identification of the morphotypes by the K-means clustering analysis, a linear regression analysis was conducted using the data from the juveniles and from each morphotype.

Identification of morphotypes All measurements were based in the method of Kuris et al. CC a b This size difference was attributed to differences in the quantity and quality of food, due to the flood cycle. Our results supported the hypothesis that coastal and continental populations of M. Contributions to Zoology, vol. Additionally, the spination pattern of the chelipeds among the four morphotypes of our specimens was quite different, similar to demonstrated by Moraes-Riodades and Valenti All these differences persist also in long-term cultures maintained under constant conditions.

This oversupply of food also ends up attracting prawns, which are usually used as bait, especially to catch silver croaker Plagioscion squamosissimus Heckel, University of Oklahoma Press.

Fecundity and fertility of Macrobrachium amazonicum (Crustacea, Palaemonidae).

Table 1 provides a detailed description of each group. After identification of the presence of morphotypes, chelipeds of ten animals per group were photographed with a Nikon D digital camera This analysis was conducted as an exploratory tool to search for any evidence of groups’ separation and reduce the number of variables.


Both types bear a few spines and some low prominences resembling very small tubercles. Four groups of males, differing in color,spination pattern and body relationships, were identified. Macrobrachium amazonicum Heller, June 5, ; Revised: However, when we compare our results with those obtained by Santos et al.

These differences seem to be closely related to ecological characteristics of the environments inhabited by these populations. Carapace length ranged from 4. The moulting cycle of larval Amazon River prawn Macrobrachium amazonicum reared in the laboratory. In summary, our data show biologically relevant differences in life-history traits of shrimps from the Pantanal compared to M.

Material and Methods 2. Acta Limnologica Brasiliensia, vol.

Macrobrachium amazonicum – Wikispecies

In general chelipeds were greenish and terminal segments carpus, propodus and dactyl more intensely moss green coloured. Japanese Journal of Ecology, vol.

This may be due in part to a 2. La peche crevettiere de Macrobrachium amazonicum Palaemonidae dansleBas-Tocantins apreslafermeturedubarrage de Tucurui Bresil. Therefore, it is necessary to continue investigations about our species, in order to develop technology adequate to our reality and in a future allow prawn farmers to culture other species. In this context, further studies should be conducted to better understand how the environmental factors influence the complete male population structure development of M.

This study records, for the first time, the occurrence of all four male morphotypes in a population of Macrobrachium macrohrachium from a continental environment, with an entirely freshwater life cycle.